Loose-leaf binder



May 28, 1940.- E. N. FARKAS LOOSE-LEAF BINDER Filed Dec. 10, 1938 FIG. 2

FIG. 1.

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Patented May 28, 1940 UNITED STATE LOOSE-LEAF BINDER Emil N. Farkas, Chicago,

11]., assignor of one-half to Frank F. Farkas, Chicago, Ill. I Application December 10. 1938. Serial No. 244,951

This invention relates to new and useful improvements in loose-leaf binders and particularly of plastic material or the like.

Binders of plastic material are usually made in the form of a comb rolled up along tudinal axis-with the teeth overlapping the back of the comb. The material is suillciently re silient to permit the operator to pry open the teeth for insertion through the marginal perforations of the leaves. 'After'assembly the teeth are placed on the inside of the roll.

I have found that when such binders are used to hold together a large number of heavy leaves, they have a tendency to open and catch on the leaves. This'is true particularly for plastic materials having slick surfaces.

To overcome this, in accordance with the present invention, I indent, serrate or roughen the overlapping surfaces of the roll of plastic binders whereby it will resist the strains to which it may be subjected during use.

Three embodiments of the invention are illustrated in the perspective views (partly in section) of Figs. 1-3 of the drawing, Fig. lillustratinr; a serrated or roughened, and Figs. 2 and 3 two types of indented overlapping surfaces.

As shown in Fig. 1,'the binder consists of a comb having a back I and teeth 2. The comb is rolled up along its longitudinal axis so that the teeth 2 overlap the back I. To guard the comb I roughen the inner surfaces of the teeth as indicated at 3, and those portions of the back I which contact with .the teeth, as indicated at 4. I have found that placing the teeth 2 on the better results than when they are on the inside of the roll.

nation at I3 is bent up into registry with The operator may pry the roll open, pass the teeth 2 through the marginal perforations of the leaves, and then snap 'them in place.

In the modification I is perforated at H and the material. cut out bent down as shown at l2. The projection 12 in each tooth l0 registers with a corresponding perforation "in the overlapping portion of the back Ii. The material struck up to form perfothe perforation II in the tooth ll.

projections 22 are formed in the its longioutside of the roll produces shown in Fig. 2, each tooth In the arrangement shown in Fig. 3, the fingers 20 are indented as shown at 2| and registering contacting portion of back 23. n

In all the three embodiments the operator may 5 pry the cylinder open without the need of special tools and without mutilating the structure, and yet the teeth will be held from sliding open even when used on heavy books. The teeth and the back are thus held against relative longitudinal movements but are free to move transversely with respectv to one another.

What I claim is:

1. In a loose-leaf binding device, a comb of resilient molded composition having back and teeth rolled into a cylinder of predetermined diameter the longitudinal axis of which is parallel with the back, the, teeth being transverse thereto and overlapping the back, cooperating projections' and recesses formed in the back and teeth which interlock when the cylinder is of said predetermined diameter, the projections and recesses being shaped to lock the cylinder against enlargement of its diameter in response to forces normally applied thereto and unless the teeth are pried laterally away from the back, but when the cylinder is. radially compressed the projections will spring out of the recesses and permitthe rolling up of the cylinder into one of smaller diameter. y

2. The binding device defined in claim 1 and in which the projections are bent out portions and the cooperating recesses are openings.

3. The binding device defined in claim 1 and in which the projections are bent down portions of teeth and the cooperating recesses are openings in the back.

4. The binder defined in claim 1 and in which a bent down portion of each tooth engagesa wrresponding opening in the back, and a bent 40 up portion in the back formed adjacent each opening engages an opening formed in each tooth adjacent the bent down portion.

, 5. The binder defined in claiml and in which the projections and recesses are in the form of 4 interlocking corrugations formed in the back and teeth. 

